Study on the Regularity Water Consumption of Winter Wheat and Its Ecological Basis under Water-saving Irrigation Conditions

The characteristics of field water consumption of winter wheat were studied from soil water content, crop growth and meteorological factors. The results showed: the changes of water consumption intensity by winter wheat showed double curves at better soil water conditions. Though the time and value of the peaks in different irrigation treatments were different, they accorded with the irrigation time. Irrigation reduced the ability in using pre-seeding soil moisture. Before jointing stage, the field water consumption of winter wheat and the atmospheric evaporation were of significant positive and linear correlation. After jointing stage, there was a positive linear-correlation between water consumption and dry matter accumulation or soil water content. Jointing stage is the critical stage of water consumption of winter wheat.